Hello,
I have seen the bug for the bulk updater dialog in Chrome:
https://dev.blesta.com/browse/CORE-2598
But to expand on this; in Edge on Windows 10, you are unable to select anything in the drop down box for "With Selected Tickets" (eg. "Update Status").
Secondly, in Chrome, the bulk updater dialog box doesn't appear at all for Open tickets. There is something in the new version of Chrome that is causing this issue because it stopped working in 3.4.3 as well (I thought an upgrade to 4.4.2 would fix it, unfortunately it didn't) and I have tried on a different PC in Chrome. It works in Edge.