Assets problem (/cpresources/transforms/) after update to Craft Client 2.5.2750
I had similar issue but I was tinkering with Elements API. The JSON payload gave me that cpresources/transforms/ but once I clicked on the link it shows the proper image with the transforms applied.

Upon returning to the JSON printout, the URL for the assets looks correct. In my case it is pointing to the S3 bucket I had setup previously.