Did you mean b2evolution version or gallery plugin version ?

For b2evo, check last lines on http:// yourhost /admin.php

For plugin, chek availables plugins on http:// yourhost /admin.php?ctrl=plugins (b2evo :: app settings :: Plugins)

Nino, solved your problems in the gallery plugin thread :)

But for the sake of the topic, you can also check the b2evo's version by looking at the meta-generator tag in the blogs source on the front end.

<meta name="generator" content="b2evolution 1.10.2" />

It's also on the bottom of every page in the back office, unless you have a really old version. In that case it's on the top of every page in the back office.