We have a legacy app (ActiveX/VB6) that uses an activex control named Flexcell.

It can be downloaded from: http://www.grid2000.com/

Flexcell is a Grid/Spreadsheet-like UI component that enables to edit cells with some capabilities, such as display a button to provide custom actions.

When hovering any os these buttons, while running thru Winflector the app will freeze and no longer respond. 

Steps to reproduce:

- Download and install the Flexcell ActiveX Control; it already comes with a sample apps that can be used to reproduce the case;

- Config winflector to serve the application: %programfiles(x86)%FlexcellVBDemoVBDemo.exe

- Access the application thru winflector, and select the option "Demo 1 - Cell Types"

- Click in any cell inside the column "Button". When focused, a three-dotted button will appear. Just hover the mouse over it. The application will freeze and its process in the server loop forever (CPU Core 100%).

I've uploaded an animated gif to show the above steps:

https://imgur.com/a/N84lvM7

Apparently, it is related to some GDI+ drawing step, as I could infer from the call stack.

Please advise, so this is important to us. 

Thank you in advance.

Could anybody just please give a feedback?

Could this issue be reproduced? Is it considered as fixable or not? Any advice?

Hi Rafal,

Thank you for your response.

I just upgraded our server to the version you mentioned (3.9.6.5). As I can tell, the issue seems indeed to be fixed in this version (until 3.9.6.4, it wasn't IIRC).

I'll rollback some workarounds we made (we've hidden these buttons temporarily) and see how it goes with our users. I'll let you know in any case.

Thank you very much for your assistance.