Here is the response I got from Invision
"...Hello,As mentioned previously, to change the display size of the profile photo you would need to alter the theme. This will require a theme customization in order to change that. Unfortunately, customizations fall outside our scope of support. You can reach out in the Theme Assistance forum on our community for further assistance.
As mentioned previously, this field is for the maximum image size which a user can upload and is stored on your server. It is not the display size of the image when viewing your community. As you were using a custom theme in a previous version, this could have been the size which the author made it for that particular version. However, this is purely a theme customization and not a setting in our software...."
Here is a screen shot I have using your theme from 4.2 before going to 4.5
What it down sized to
I remember asking this same question years ago and I think you had me change something in the html/CSS???
IDK...I'm lost...I have two groups telling me it can't be done but it was working fine up until I upgraded. This is why I hate upgrading, lol