I posted a similar question to this some weeks ago, but I'm still having difficulties - the problem being that the OPL is very slow to load. I can load up one page of problems from any topic (ten problems by default) immediately, but if I try then to load the second page, sometimes the system simply times out. Last night I simply gave up, after trying valiantly to reload a second page, with multiple logout/login cycles.
I was told that this might be due to an infinite loop somewhere, but I'm not sure where it would be. I've not made any changes to the OPL or its directory structure. I also find that using WW3 is a little better than WW2, but even then sometimes I have difficult displaying problems.
I have upgraded my linux (Ubuntu 14.04) system in order to scotch the ShellShock vulnerability, and then restarted apache.
This has been an issue for some time - is there an (easy) fix?