CVS sets read-only attributes on *.tcl, *.cpp and *.java files

Hi,

I am running into an issue with cvs update and cvs add commands. When
I run them, the file attributes for *.tcl, *.cpp, and *.java files
change to read-only.

I have checked the IDE for any otpion that enables commiting the files
as read-only. All options are checked off. There's also nothing
suspicious in the system settings. I have checked that no $CVSREAD
environment variable is set or the global option -r with the commands.
I use the client-server Concurrent Versions System (CVS) 1.11.5

I do not use watch on/off commands as well.

Any ideas on what's going on with the CVS?

Thanks much,
Hrachya