Thanks VWD and Philemot, great work.

Just to keep you busy on a Saturday night here is a description of a couple of problems I have come across. (apart from trying to run it with too many objects in scene or trying to run it with No Sub Samples of greater than 20 with maximum No iterations of 7 or greater)

Error1. Windows10Insider14915 only, If I add a Figure as Collision object before adding a Wardrobe item(or items) as Collision objects and then add a Cloth(or Hair) item, I get a Violation error when starting simulation(or Generate springs for Hair). See image "vwd error v42 figure first". I get the error every time when using elements below. However error does not occur on other combinations of Figures and Wardrobe items (sorry I don't have list of elements that it worked ok for). If Wardrobe item(s) are added before Figure then error does not occur when running Cloth simulation. This then works ok for Cloth (e.g. Nwear_shirt) dynamic simulations, however Hair simulation has further issues, see error2 below.

Error2. Violation error when starting/running Hair simulation. Have run Static simulation with Collision elements Nwear_shirt and Victoria4.2 and Maria Hair as Cloth element to create element Maria_Hair_1. Restart VWD and add Collision elements Nwear_shirt and Victoria4.2 (in that order) and then add Maria_Hair_1 as Hair. Select Victoria4.2 as collision actor for Hair. Select Preset of Victoria42 DAZ in Hair parameters. Show hair and generate springs. Start dynamic simulation. On Machine 1 simulation starts but fails with a "Bridge to VWD crashed..." error anywhere between frame 1 and 235 (of 311frames). See image "vwd error hair v42 machine1". Once error message appears then unable to close VWD. When trying to close VWD it brings up a Violation error message in VWD. Only way to close it is to kill VWD process. On Machine 2 simulation does not start, it immediately brings up VWD Violation error message. See image "vwd error hair v42 machine2". However am able to close VWD after error message has been displayed.

I was able to complete a short 100frame Hair simulation on machine 1, however it was a once only event and all other attempts at dynamic Hair simulation of 100frame or more failed.

Elements; Victoria4.2 Nwear_shirt by Masanori Kobayashi Maria Hair and OOT Hairblending by outoftouch Animation - blank aniblock, start-(N),3x forward_1_cycle, stop-(N), blank aniblock, start-(N), corner right (for total of 311 frames) from aniMate Walk Construction Kit by GoFigure Hongyu's Bikini 2 for V4/A4/G4/Elite by hongyu (not part of simulation)

Machine1 Windows10, DAZ4.9 and DAZ4.9.3.71PublicBuild, VWD 1.0.408.2976 Machine2 Windows10Insider14915, DAZ4.9 and DAZ4.9.3.71PublicBuild, VWD 1.0.408.2976 The multithread values are as set by VWD. Both machines have more than adequate system and video ram.