I got it working when connected to the car too. Here's the odd series of events:
- V2 FlashScan connected to the OBDII
- Opened V8, attempted to connect to the V2 FlashScan and got the "cannot detect any FlashScan".
- Closed V8.
- Disconnected the OBDII.
- Opened V8, attempted to connect to the V2 FlashScan = SUCCESS.
- Closed V8.
- Connected the OBDII
- Opened V8, everything works now - logging, tune calibration flash, etc

Note: This is the first time that I connected this new tablet, so not sure if that has anything to do with it.