Crystal V

​It's under Core > Global > Plugins in the Theme editor.
I will try testing on an iPhone over the weekend. It's working on my Android phone so it may be iOS-specific.
The wrong positioning is a bug and I've created a fix for it on my test install. I will release the fix after I test the WhatsApp plugin on iPhone. 
Thanks.

Yeah   It has been 'Hide in desktop mode?'
Thank you!

I'm able to install fine on 4.0.2. Created a fresh install to test.

Is the button not appearing? If so, you need to be in mobile/tablet though you do have ability to toggle 'Hide in desktop mode?' in System > Sharing > WhatsApp > Edit. It's set to off by default because WhatsApp Web didn't support sharing last time I checked.
What's the error you're getting if that's not the issue?

I'm able to install fine on 4.0.2. Created a fresh install to test.

Is the button not appearing? If so, you need to be in mobile/tablet though you do have ability to toggle 'Hide in desktop mode?' in System > Sharing > WhatsApp > Edit. It's set to off by default because WhatsApp Web didn't support sharing last time I checked.
What's the error you're getting if that's not the issue?

Okay, finally I can reply.
This plugin would not have caused issues with memcached but, yes, at the time it would have caused issues after having disabled via plugin rather than System > WhatsApp > Sharing.
I've released version 1.0.4 which completely changes how this plugin functions so this issue should be resolved.

Okay, finally I can reply.
This plugin would not have caused issues with memcached but, yes, at the time it would have caused issues after having disabled via plugin rather than System > WhatsApp > Sharing.
I've released version 1.0.4 which completely changes how this plugin functions so this issue should be resolved.

​That issue is generally caused by a missing template. There is an IN_DEV specific template (which is uploaded to /applications/core/dev/html/front/sharelinks/whatsapp_cvh.phtml) and then there's the one saved by IPS when installing the plugin. 
I'll make a note in the zip of how to uninstall the plugin correctly (which, yes, you have to delete the physical file in /system/content/shareservice before uninstalling the plugin).
Thank you for bringing this to my attention and I'm sorry it caused you issue. :/
edit: I have some ideas how to make this a non-issue in the future (by somehow piggy-backing on a hook).

​WhatsApp sharing doesn't work in non-mobile/tablet devices so it's turned off in desktop view by default though it can be turned on in plugin settings if you wish. The setting will be moved from plugin settings to Sharing > WhatsApp settings in the next release.

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​Okay, I tested a few times in RC4 and was able to replicate up until I edited custom.css when editing CSS in Themes. I did notice the CSS/JS was gone from all the hooks I'd installed. This was prior to doing anything but upgrading to RC4 so I think it may be an IPS bug. I'll submit a bug report to see.
Is the CSS at least appearing under /core/front/custom in Appearance > Themes > Edit HTML and CSS > CSS? I was able to get the CSS to be compiled on the frontend by editing custom.css under the same sub-folder in the Themes editor and then emptying the IPS cache folder . I didn't test in Designer's Mode, just the Themes web editing.

Oh, it's changed? I was going to try to keep an eye on WhatsApp Web. I tested when I last updated and share wasn't working on desktop...
A CSS file is supposed to be added. I'll test in RC4 (I'm assuming that's what you added it to?).
edit: WhatsApp Web sharing still isn't working for me. 

Make sure the file is here: /your-ips-root-folder/system/Content/ShareServices/Whatsappcvh.php. As long as the file is there it should show in your admin cp on the sharing page even if you haven't installed the .xml file. The .xml file is only for the template. If might be named something odd - Whatsappcvh - if you haven't installed the xml file.
Is it showing on topics in mobile/tablet? Or just not in the admin cp? The latest version hides the share link on frontend on desktop view because it doesn't do anything there.  Could put a toggle setting if this is your issue?

@sobrenome Sorry, forgot to tag you.

Adds the WhatsApp share service/link to IPS4.
Click on the WhatsApp icon after installing to share, then click the user/conversation in the app, and your text will appear. Edit the language strings to change the text.

I've updated to do just that. Thanks for the suggestion.

Pretty cool. A suggestion, maybe you could set it to be shown only to users using a mobile device.

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No. All files from category "IPS Community Suite 4" will not work with previous versions

Thanks Gabrielle 

Adds the WhatsApp share service/link to IPS4.
Click on the WhatsApp icon after installing to share, then click the user/conversation in the app, and your text will appear. Edit the language strings to change the text.

Thank you Gabrielle.
 

Adds the WhatsApp share service/link to IPS4.
Click on the WhatsApp icon after installing to share, then click the user/conversation in the app, and your text will appear. Edit the language strings to change the text.

Very nice! It will be my first customization! 

​It's part of my custom app right now but I'll look into making it into a separate plugin. So far I have WhatsApp, Tumblr, and Pinterest as extra share services.

I did.  I just added the template, the CSS, and then Whatsapp.php to to system\Content\ShareServices.