We recently updated to 5.2 (from 5.1) and have seen our jqgrid tables freeze (no vertical scrolling) on initial load.  Horizontal works. When we rollback and test in 5.1, the same data does not freeze the table, and it operates as expected.

The 5.2 table will unfreeze after about 45 seconds, and normal operation of the app is possible, until the next browser refresh when it will freeze again.  This does not happen on 5.1

Is this a known issue?  Any suggestions on what might be causing this?

Same behavior occurs when tested in latest versions of Chrome/Safari.  Using bootstrap.