![culex](https://xoops.org/uploads/cavt4a2ff03cb2223.jpg)
My local server and webserver both run xoops 2.5.6 and a previous version of php / mysql so could be why.
EDIT: Just checked with newest php / mysql / jquery and Xoops. All seems to be good. I did notice though that in 2.5.7 you'll need to make the block IM visible.
I tested with this.
Users: registered users
IM block - right sidebar
visible: Yes
All pages
Then it worked. But i did not get any white pages. Try to uninstall IM - turn debug on in admin settings and install IM again and se what errors pop up