found in aam-dev nightly build (oracle). Still need to test on MIT rc3 builds.
I created an assessment including a file upload question (6.16 regression test) on our nightly build and took it as a student, uploading and removing files several times.
About every third time I removed my uploaded file and uploaded another one, the assessment timer would break, dropping to nearly 0 or going to negative numbers (see attached image).
Once I got a "string index out of bounds" exception (see attached), but haven't been able to reproduce that or determine what caused it.