PHP errors after upgrade
Using Jamroom
Check that your server has symlinks enabled.
When a module is initially installed its in a location like:
/modules/jrCore
then when it gets updated, whatever was on /modules/jrCore gets moved to a location with its version number
/modules/jrCore-version-6.4
and a new version also gets added
/modules/jrCore-version-6.5
Then /modules/jrCore turns into a symlink to the most recent version of the module.
If your server does not allow symlinks then that would cause an issue.
Are you able to access the ACP?