Fences against driveways - just check each lot when you play, it's easily spotted and fixed and won't screw up any other lot, just causes problems with walkbys and sims getting out of vehicles. Since there are one or two default lots that have this issue (stupid Maxis!!!) I thought it was worth mentioning in case it had some bearing on your problem.
If you use the Clean Installer to run through your mods, there is a column which should show you the date the mod was last modified. It doesn't necessarily mean anything, some mods never needed to be updated since they were first made, but where you know a mod has been updated before, it could make you suspicious of one that was created before your latest expansion pack. Obsolete mods, you can't really be sure without checking every one, but if you have one that addresses a problem that was solved with a patch, then obviously, that is no longer necessary.
With Pescado's mods, check the .zip file for your latest EP, and if the mod isn't there, and isn't a specific Uni mod, then you probably no longer need it. For some reason, Pes doesn't include his Uni mods in the .zips, you have to get them from the University mod section.
My understanding is that a bad gosub error is often the result of an out of date mod, so this is definitely worth checking out.