Really odd problem
 

just loaded up my saved game from earlier, and I can add new way points to my existing course. However I cannot erase any preexisting waypoints. Really strange and i've never heard anyone else report such in a thread. Currently using ROW + T.M.1.7.6 + RSRDIII. Any ideas guys?

Thats a new one on me CB... the only problems i ever encounter when reloading a savegame is the engines are always set to stop.
Main mods i'm currently running are:-
TM1.7.6 (inc addons gfx/sound)
RSRDC III for TM
NSM4 (Classic)

Strange
 

Haven't heard of this one either.
Have you tried both 'erasing' methods i.e. select the eraser then "Ctrl-shift-delete" which, if memory serves, erases ALL waypoints and markings on the map.

the method you suggested Tomoose does not work. When I use the plot search pattern icon itis those waypoints that will not erase. Anny I plot after those will erase. SUX gonna have to start a new career again. Fortunatly it is still my first patrol. (trying manual TDC)