@ 6thpink,
thank you very much, now it works!
After reading your instructions I`ve changed the following line:
Your Patch:
Index: fvwm/events.c
===================================================================
--- fvwm/events.c (revision 12)
+++ fvwm/events.c (revision 13)
@@ -158,6 +158,7 @@
...
And now:
Index: fvwm/events.c
===================================================================
--- fvwm/events.c (revision 12)
+++ fvwm/events.c (revision 13)
@@ -164,6 +169,7 @@
...
Youre right, it
s so simple … 
Now today`s cvs is working with all patches I like!
Thanks to all & Greetings
EDIT:
I have to edit this:
There was a little error in the patch and this error is the reason for the Problems:
This line is missing in fvwm/events.c:
fd_set init_fdset; (somewhere at line ~163)
The Patch doesnt add this line, so I have played around with the patch und this Patch is now working correctly, tested with fvwm-2.5.21 and today
s cvs-Source (for cvs you have to take a look at the lines and change them if needed):
Index: fvwm/events.c
===================================================================
--- fvwm/events.c (revision 12)
+++ fvwm/events.c (revision 13)
@@ -159,5 +165,7 @@
int last_event_type = 0;
Window PressedW = None;
+Window HoverW = None;
+fd_set init_fdset;
/* ---------------------------- local functions ---------------------------- */
...
That`s it, is working clean here.