You probably had a D drive at one time and installed PinballX there, if that is the last place you installed PinballX then that is where Database Manager will look. Run the PinballX installer to update/overwrite in its current install location and that should clear this.
i cant get the program to use b2s server in frount end the last it worked was in 6.11 it could be something to do with direct output or b2s server bu havn't found a soluction yet i will report back when i find the answer.