I have clicked on the tag cloud in a few 3.8.2 installs and get this: Software error: C4::Output version 3.02 required--this is only version 3.08.01.002 at /home/koha/kohaclone/opac/opac-tags.pl line 41. BEGIN failed--compilation aborted at /home/koha/kohaclone/opac/opac-tags.pl line 41. I tested it on Master and the problem isn't there (if that helps tracking down the issue).
*** This bug has been marked as a duplicate of bug 8315 ***