Hi PMDG support !I recently bought your MD-11 v1.21 and B747 v 2.10.0040 , DVD boxed edition.First , I installed the B747 , that loaded without any major problem :( Then I installeld the MD-11 ..... :( As many other users the sim loaded with black gauges , + problems with the B747 (no active gauges) .After several uninstall , reinstall , repair install , reinstal c++, registry clean , etc.., I had a look to the files installed during setup .I found that PMDG_Simconnect_Ldr.dll had changed from version 10.0.61.355.40 to version 10.0.61.355.62 after MD-11 install.Just deleted the file , repaired B747 install and then ..... MIRACLE .... both aircraft load !(one time by FSX session , but its better than nothing, it seems that users can't ask more to PMDG products :( )My Simconnect .dll file version is 10.0.60905.0Any comments ? Thierry V. "Poukiki" B)

Very interesting. I have a download version of the 747. I beta tested the MD11 so I have installed/reinstalled both in various sequences without problem (except one that might not be related). The good news is first you found a solution and second you posted it here. Maybe Ryan can shed some light on what you found.