I am getting the same issue. I paid my subcription as usuual on March the 10th. My problems started on the 17th of March when i was asked to renew my subcription. Premiere Pro then would not open showing the message 'This Project contained a sequence that could not be opened. No sequence preview preset file or codec could be associated with the sqeuence type.' I was working on a project that had been shot on a C300 in .mxf / I believe that this is a form of denial of service by restricting the codecs to DV and DVcPro. Any other codecs are hidden by the Adobe Subscription Police....
Not only is it frustrating that i have to explain to a client why i cannot deliver the edit on the day promised it makes me very nervous about using the creative cloud in the future as i work on very time sensitve projects and do not have to the time to spend 60 minutes on hold to tech support in India.
After finally getting through to tech suport i have resolved some of the issues but After Effects cannot import MXF's and everytime i open PPro or AE i have to renew my subcription.
Please Please Please Adobe sort this out.