I'm having a problem with Perch login after a site's 2.8.34 update. I'm immediately logged out and the logout URL ends with %2Fcore%2Fapps%2Fcontent%2F. I've seen this before and I know that this is a sessions problem but the web host tells me that sessions are being written in the appropriate location.
I solved this issue before by an upgrade to Perch 3. Is that the only solution?