M3 is aware of an issue that was created from last evening's release to Accounting Core where users cannot import a Journal Entry file directly from within the General Ledger module. Our teams are already working to resolve and we are aiming for a Production Patch tomorrow evening. We will update the time and date as soon as we verify the fix.
In the meantime, the Import Export Utility is still working as expected, so users can utilize this feature to import any Journal Entries.
Thank you for your patience and we hope you are finding value in the enhancements from Monday night's release.