While surfing from mobile. today i saw that Full version button isnt working more to change the skin to full version.

Sorry if this issue is already discussed in here before my thread.

Attachment button also not working at my end.

Same problem here on mobile. Happened after update this board to 3.4.5.

Yep getting the same issue with the mobile skin.

If you are seeing issues please submit a bug report in the tracker with as many details as you can include.

Be sure to clear your browser cache if possible, as we just upgraded yesterday (and made many other simultaneous changes which could cause things like missing buttons to occur if you have an old cache).