During the installation process it is clear mentioned that the following folder are to be open for write access

xoops_data/caches
xoops_data/caches/xoops_cache
xoops_data/caches/smarty_cache
xoops_data/caches/smarty_compile
xoops_data/configs
xoops_data/data
xoops_data/protector

What about this one xoops_lib/modules/protector/configs/ ?

I can't remember exactly where I got this from but I am pretty sure it caused me some troubles in the past when it was not enabled for write.

Quote:
As of XOOPS 2.5.10, the protector data moved out of xoops_lib to xoops_data/protector.

This was done to move all writable data out of xoops_lib to simplify security management.