I haven't had any prblem using the 737 PMDG with SP1b but istalling the SP1c caused the loss of all cockpit sounds (EGPWS, switches, callouts, flaps, breaks, alarms, etc.). I have Windows 7 Home premium 64 bit I have installed and uinstalled twice the add-on PMDG 737 NGX and the SP1C in 2 different computers with the same problem. However the engines sounds work fine. Do you have any suggestions what can cause this problem?
Thank you