Hi,
I have a web server running CentOS Web Panel including Roundcube 1.2.3.
Recently I have updated Linux including the kernel (because of Meltdown/Spectre) and also the CentOS Web Panel version to 0.9.8.273.
Since then I have one problem in Roundcube. I can't expand or collapse folders. The Folders are in the state they were before the update (expanded or collapsed). When I click on the icon in front of the folder name to expand/collapse a folder I get "Server error! (Forbidden)" in a red box for a fraction of a second and the folder goes back to its previous expanded/collapsed state.
Everything else seems to work fine. I can move emails to folders that I can see. I can create or delete folders. I just can't collapse or expand folders, even newly created ones.
It seems that Roundcube can't access whereever it stores the folder states. But I don't know where it stores that.
Any idea what I can do to fix this, please?