Strange, try a restart of pc, if it does not help make a printscreen, I have some difficultie in understanding wath you mean with opening main window. Do you mean preview? Or a page?

Thanks, let me know how it works out.

I tried lot of things to do, nothing worked, I re-installed.

When the application is launched, there is a moving green strip in the app´s window and there are some signs like "library updating", "opening the main window". Right after that the app is launched. In my case, the app didn´t launch.

What kind of pc do you have? What operating susytem ?

Did you download latest version from here in answers ? Else try this, you can find it here: https://helpcenter.websitex5.com/en/community/users/downloads

or use top right pulldown menu next to your name.

Hello Branislav Z.,

Did you install in the meanwhile any new program on your computer?

Try please also the procedure described on https://helpcenter.websitex5.com/it/post/157225

Many thanks!

Yes, there was Win update installed meantime, including Net frames update. I guess these upadtes may cause X5 malfuctioning. (?)

Hello Branislav Z.,

It can depdend on this. In this case proceed to disable the .NET Frameworks again and then uninstall them with this tool:

http://cid-27e6a35d1a492af7.skydrive.live.com/self.aspx/Blog_Tools/dotnetfx_cleanup_tool.zip

Once done download them from following linsk and reinstall them:

3.5

http://www.microsoft.com/en-us/download/details.aspx?id=21

4.5

http://www.microsoft.com/en-us/download/details.aspx?id=42642

Many thanks!