Problem: EVE Mentat doesn’t read all market data from cache or reads nothing.
Reason: This problem can be reproduced during the simultaneous use of EVE Mentat and EVEMon 1.7.x+ (or EVEMon Market Unified Uploader – EMUU). EMUU is active by default in EVEMon 1.7.x.
Problem in fact that EMUU deletes market cache files after uploading and other tools unable to work with market cache correctly.
Solution: You should disable Market Unified Uploader in EVEMon.
To do this perform next steps: