I'm not having any issues with the trainer itself as it appears to be working great as per usual. The issue/nuisance I'm experiencing is the the version number of the GTA4 Trainer itself may be misreported when used with the Trainer Manager v1.008 Tool. The GTA4 Trainer reports itself has being v1.000100 and the Trainer Manager always reports that there is a new version avaiable. I've downloaded the "new" version several times, but the version is always the same (v1.000100).
I suspect that I am indeed using the latest trainer version for the game, but there may be a small bug in the code in that its misreporting an older version back to Trainer Manager? Anyways, when you get a moment to update the trainer or during the next update cycle, you may want to fix this minor version reporting issue.