@siria, first of all, thank you for your suggestions. I appreciate your efforts to help
Now, I'll try to answer your questions:
> Strongest suspicion: a bad URL in your previous session...
No, it happens now with all URL that I try, including K-Meleon home page or this forum...
> Are you using the *final* 75.1 version? If unsure, which date has your k-meleon.exe?
It is portable version of latest stable release K-Meleon 75.1 (2015-09-10), downloaded 2015-11-11. It has CRC32: B861BFA0.
Some additional details about the environment I'm using:
I have outbound firewall, watching all connections from my computer to the Internet. And I'm always using Proxomitron - local proxy service. All HTTP/HTTPS connections should go via this service only. I used it successfully with K-Meleon before the problem, discussed in this thread, has started. It short, it was working OK (except KM do not obey its own settings and always tries to bypass my proxy, but it should be discussed separately).
Now I suddenly got this this endless loop... What I do now:
1. Remove Profiles folder (from KM root folder)
2. Start KM and allow direct connection to:
216.34.181.96 (kmeleon.sourceforge.net) : 80 (BTW, how to prevent this?)
3. F2, Network/Performance, Proxy, New Configuration - made new configuration with name Proxo and these settings:
"Use the following manual proxy settings"
HTTP, host name = localhost, port = 8080
Click on Save button
4. In Network/Performance, Proxy, General set radio to Use the following user-defined proxy configuration and assign it to Proxo. Click on Close button.
5. Right click on toolbar and allow to show Menu toolbar.
6. Go to Bookmarks, K-Meleon Project, K-Meleon Forums. It opens this forum OK.
7. On that page clock on General (forum)
8. Got K-Meleon crashed.
Note: The same thing happens if in p.6 I try to open K-Meleon Home page... So, it's not the URL that causes the problem here.
I've repeated this procedure it from p. 1 to 8 again couple of times and got the same result. Reboot of my computer did not help too. I've even extracted portable package into another folder and tried it again... The same problem.
Obviously there is something kept on my computer, that makes it crash now. Does portable KM use registry? Does portable KM used some files from other folders of my computer? What should I clean up now to get it working???
P.S. Posting this reply using IE (KM still crash)