pagination not working, document.massupdate.uid is undefined

My pagination and sorting is not working. I am getting javascript errors from sugar_grp1.js, that document.massupdate.uid and also theform.uid are not defined. I had been doing some work on adding a custom view to my Accounts module, so I thought perhaps it was something I did there. So I removed those changes and did the “quick repair and rebuild” and “rebuild relationships”, but I still had the same problem, so I’m thinking it’s probably unrelated.

I’m currently on version 7.7.9 (I know, I know, updating is on my to-do list). I haven’t made any other changes or updates aside from what I already described above.

Any suggestions on what might be going on, or troubleshooting tips?