BaseCamp 4.5.2,
driver grmnusb.sys 2.3.1.0,
Windows 7 SP1 64bit all up-tp-date and genuine,
no patches on basecamp,
etrex 30x with latest genuine firmware,
topoactive europe 2.0.1 genuine,
topodrive hellas v2015.B1 genuine.

I've already uninstalled, cleaned everything, reinstalled, deleted all tracks from device (since it's a common problem that can cause basecamp to crash), reset the application and the device. Yet, the problem remains. I didn't have any problem prior to installing the unlocked anadigit 6.41 map to the microsd. (As I said before, I already removed the microSD and removed this map).