Hi all, I am developing a gui app that captures a wim image using a DllCall to wimgapi.dll; the capture process uses a callback to notify my app on the progress of the capture and update the progressbar as appropriate. my issue arises during the capture if the you try to interact with the GUI (ie. click on the window/a control/etc) the window will freeze and not update any controls, as well as trigger windows to flag the window as "(Not Responding)". and will cease to update the gui until the e