An important bug has been fixed on LabKey 15.3 r42135.48 regarding WebDav and the recent updates to Tomcat, specifically Tomcat 8.0.30+ and Tomcat 7.0.67+

Due to unforeseen changes with Tomcat's handling of WebDav calls, some functions with the FileContent module (Files Web Part) would cause issues with creating new folders, generate Error 400 responses in the background, or even prevent LabKey from starting due to the WebDav controller failing during the initialization.

All WebDav bugs have been identified and fixed, so if you have plans on upgrading Tomcat to one of the two versions listed above, please make sure you download our revised LabKey 15.3 build.

Regards,

Jon - LabKey Support