Hi Pete, 
  
Further to my previous post, please see comparative log files for the FSX Microlight and the Aerosoft Airbus A319. As you will see there doesn't seem to be any issue appearing in the log file? It is still stuttering every 4-5 seconds in the Airbus A319, more noticeable when in turns. 
  
********* FSUIPC4, Version 4.938f by Pete Dowson ********* Reading options from "E:\Flight Simulator X\Modules\FSUIPC4.ini" Running inside FSX on Windows 7 Module base=6BCB0000 User Name="***" User Addr="***" FSUIPC4 Key is provided WIDEFS7 not user registered, or expired        15 System time = 02/02/2015 12:42:19        15 FLT path = "C:\Users\FSX\Documents\Flight Simulator X Files\"       312 Trying to connect to SimConnect Acc/SP2 Oct07 ...       312 FS path = "E:\Flight Simulator X\"       655 LogOptions=00000000 00000001       655 SIM1 Frictions access gained       655 Wind smoothing fix is fully installed       655 G3D.DLL fix attempt installed ok       655 SimConnect_Open succeeded: waiting to check version okay       655 Trying to use SimConnect Acc/SP2 Oct07      3354 Running in "Microsoft Flight Simulator X", Version: 10.0.61637.0 (SimConnect: 10.0.61259.0)      3354 Initialising SimConnect data requests now      3354 FSUIPC Menu entry added      3369 E:\Flight Simulator X\FLIGHTS\OTHER\FLTSIM.FLT      3369 E:\Flight Simulator X\SimObjects\Airplanes\Aircreation_582SL\Aircreation_582SL.AIR      8892 Weather Mode now = Theme     73617 Aircraft="Aircreation582SL red"     73617 System time = 02/02/2015 12:43:32, Simulator time = 12:43:00 (12:43Z)     78219 Starting everything now ...     78375 ASN active function link set     78375 Ready for ASN WX radar     81729 Advanced Weather Interface Enabled    121166 Sim stopped: average frame rate for last 47 secs = 30.0 fps    123631 C:\Users\FSX\AppData\Roaming\Microsoft\FSX\Previous flight.FLT    134364 System time = 02/02/2015 12:44:33, Simulator time = 12:43:47 (12:43Z)    134364 *** FSUIPC log file being closed Average frame rate for running time of 47 secs = 30.0 fps G3D fix: Passes 8967, Null pointers 0, Bad pointers 0, Separate instances 0 Memory managed: 13 Allocs, 13 Freed ********* FSUIPC Log file closed *********** 
  
********* FSUIPC4, Version 4.938f by Pete Dowson ********* Reading options from "E:\Flight Simulator X\Modules\FSUIPC4.ini" Running inside FSX on Windows 7 Module base=6BCB0000 User Name="***" User Addr="***" FSUIPC4 Key is provided WIDEFS7 not user registered, or expired         0 System time = 02/02/2015 12:46:49         0 FLT path = "C:\Users\FSX\Documents\Flight Simulator X Files\"        15 Trying to connect to SimConnect Acc/SP2 Oct07 ...        15 FS path = "E:\Flight Simulator X\"       249 LogOptions=00000000 00000001       249 SIM1 Frictions access gained       249 Wind smoothing fix is fully installed       249 G3D.DLL fix attempt installed ok       249 SimConnect_Open succeeded: waiting to check version okay       249 Trying to use SimConnect Acc/SP2 Oct07      2777 Running in "Microsoft Flight Simulator X", Version: 10.0.61637.0 (SimConnect: 10.0.61259.0)      2777 Initialising SimConnect data requests now      2777 FSUIPC Menu entry added      2792 E:\Flight Simulator X\FLIGHTS\OTHER\FLTSIM.FLT      2792 E:\Flight Simulator X\SimObjects\Airplanes\Aircreation_582SL\Aircreation_582SL.AIR     20358 E:\Flight Simulator X\SimObjects\Airplanes\Aerosoft Airbus A319 IAE\A319IAE.AIR     33353 Weather Mode now = Theme     58173 Aircraft="Airbus A319 IAE BRITISH AIRWAYS"     58173 System time = 02/02/2015 12:47:48, Simulator time = 12:47:19 (12:47Z)     59561 Starting everything now ...     60294 ASN active function link set     60294 Ready for ASN WX radar     63087 Advanced Weather Interface Enabled    282689 Sim stopped: average frame rate for last 224 secs = 29.9 fps    288040 C:\Users\FSX\AppData\Roaming\Microsoft\FSX\Previous flight.FLT    299319 System time = 02/02/2015 12:51:49, Simulator time = 12:51:03 (12:51Z)    299319 *** FSUIPC log file being closed Average frame rate for running time of 224 secs = 29.9 fps G3D fix: Passes 9383, Null pointers 0, Bad pointers 0, Separate instances 0 Memory managed: 52 Allocs, 52 Freed ********* FSUIPC Log file closed ***********