MyPhoneExplorer seems to have an issue initiating WiFi sync when more than one local network adapter is present.
I.e. I have LAN and VirtualBox Host-only adapters installed, and after changing some settings (I had to extend netmask on LAN), I suddenly lost the ability to connect to tablet over WiFi.
After many atempts, updates and reinstalls, I finally managed to connect after disabling the VirtualBox adapter, leaving LAN the only active network adapter in the system.