Problem with ActiveX C# app

I'm experiencing weird problem with an visual ActiveX control.

I've created simple test winforms application on .NET 3.5 using that 3rd party ActiveX control. It works fine on my dev PC with VS 2008开发者_运维百科 installed, but when copy it on a machine without VS installed on it, the events from this .OCX don't fire at all. It is a visual OCX, it shows up, but events dont work. If I install VS - it starts working correctly, de-install it - works partially.

What could it be? I do release build, installed C++ redist. packages and no success...

Some details - i use this ActiveX to log in to remote server, call method to retrieve recent data, and need to handle the event returning dozens of strings...

Regards,

Vlado

Thank you Menahem for the advice! I resolved the problem using Process Monitor. The missing library was stdole.dll.