This is an important message for everyone using this hotfix.
A bug was introduced causing messages and errorboxes to maintain locks. This issue was also in 3.70 and solved in build 19868 back then.
I won't get emotional about this bug but dissapointed describes my feelings best.
Please read this post http://www.mibuso.com/forum/viewtopic.php?p=107585#107585 for more information.
If you are looking for NAV platform updates or platform hotfixes you can benefit from this site if you already know the knowledgebase article number: https://support.microsoft.com/contactus2/emailcontact.aspx?scid=sw;en;1410&WS=hotfix
The kb article is kb945349
It will be published asap.