J! 3.0.3, never installed K2. I install GK5 module, then I try to open it in backend to set it, but it do not opens the normal module edit view, just a page without joomla backend style with no CSS and I cannot set nothing more that few options, also no buttons for save etc...
I've done some tests and it seems related to K2 component presence.
If K2 is installed -> works fine
If K2 is disinstalled -> still works fine (no k2 DB tables deleted)
If K2 was never installed -> don't work as described above.
Also the News Show Pro GK4-5 don't work if K2 had never been installed.
Hope you can find a solution.
Thanks