Environment:
Session Host: Windows 2012 R2
RDP Client: Any
Application: Clarion Win32 MDI based app.
Remote App mode.
Issue:
User is operating a Clarion Win32 MDI based application as a Published Remote App.
When an MDI window is opened and a user presses ALT to access main toolbar menu in the parent and then clicks outside the app and back in the whole app freezes. It stays locked with file highlighted as per below:
If I jump into process explorer and kill the MDI child thread the interface resumes per normal.
On further investigation it seems like child thread is blocking. If the user does not open MDI thread and presses ALT the issue does not occur.
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The latest Windows 10 1607 anniversary patch seems to have caused this issue on local installs now too. On investigating wait chain we see the following result on the thread:
Thread is sending a USER message:
Window 0x180618 (SampleApp.exe (8296): 7632): ClaWin024A0000H_1 "Sample Application [Sample 1]"
At this point accessing other windows, launching start menu, etc... doesn't work properly until thread is killed.