Please help us help you and fill where relevant:
LimeSurvey version:  Version 7.0.14+260904 
Own server or LimeSurvey Cloud: own hosting
Survey theme/template:
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I used the ComfortUpdate tool to update from the last 6.x version to  version 7.0.14. The updates shows no errors. After the update it is not possible to create / edit a new or existing survey (I tested it also with the adminuser, too). I only get the screen "checking permissions" with a loading indicator.
How can I fix this?
many thanks in advance.