Hotkey problem when using FSFlightmax, Radar Contact and Flight Deck Companion

Hi,Recently I had to reinstall FS2002 and add ons and ever since, if I use FsFlightmax (1.4), Radar Contact (3.01) and Flight Deck Companion (1.3), a strange thing happens: at the beginning the hotkey that makes Fmax appear/disappear works correctly. After some time (maybe after lift-off?) it does not work any longer and I have to use the FS2002 menu to cycle Fmax on and off.The same thing happens with the FDC checklist hotkey: at the beginning it works, then no more after some time.My version of FSUIPC is 2.97, while Advdisplay 2.01 or 2.02 both give the same results.I use 767 PIC, I don't know if the problem occurs with other airplanes as well.Thank you for your help,James