Pathauto has disappeared and will not display in module screen

Thanks for your help! I've managed to get it going again, but still not entirely sure what the problem is. The filename in the system table was where it was kept, so it should have been visible.

Anyway, I'll document what else I tried, in case it happens to anyone else or is part of some other issue/conflict:

In desperation to get this module to be recognised again, I tried copying it to the system modules directory, and it still didn't show up, so it wasn't just the one particular location wasn't working.

However, when I renamed the folder in the sites modules directory to 'path_auto', it was recognised again. All the permissions on the folder were unchanged, and the only references to pathauto in my entire database were in the system table and advanced help tables, but it looks like the directory with the name 'pathauto' was somehow blocked or conflicting or something with Drupal, but no idea why...

Probably not the most elegant solution (and hopefully the renaming doesn't create more issues), but I'm glad it's back up and running!

This has happened to me again and I can't figure it out. It's still in the system table, but status and bootstrap have been set to 0, and it doesn't show up in admin/build/modules. I've managed to get it to force load (add automatic alias settings to node edit page) by changing the values mentioned to 1, but visiting the modules page means it disappears again.

And it never recreates the pathauto tab in the alias settings. Hardlinking doesn't work - I guess the module rebuild removes the path.

It does, however, appear under uninstall. Going through that process doesn't cause it appear in the modules page again.

There doesn't seem to be anything in the dblog, but is there any other way to debug where it's failing to load??

This one is bizarre, I've been looking at it for the last hour or so now. I've got back to the point where if i change the folder name to 'pathauto2' it works, but back to 'pathauto' and it disappears again. Loads into system table if i do a module rebuild with it named pathauto2, but not the other way.

Did dump of my entire drupal database - the only mentions of pathauto are in locales_source and the permission table, so I can't see what could be blocking it. Path redirect was enabled and had pathauto listed in the system table as an 'enhances' module, but I've removed that entry and the module - still no luck.