I've had the same issue since the ACR update Import Details - Live Play doesn't show any activity although hand histories are being made and the Error tab shows this message:
14:05:36 Error in hand (Unrecognized file format: HH20190526 CASHID-G10681896T2 TN-Russelville GAMETYPE-Hold'em LIMIT-no CUR-REAL OND- BUYIN-0 MIN-10 MAX-25.txt)