SPC can sometimes get into an unstable state where it will not work correctly. Here are some known issues and the fixes for them.

Lower case

Having a lower case landmark or SUMFILE is very bad. SPC shouldn't let you make them, but sometimes one (somehow) slips in. If you see it, you need to correct it.

First, check to see if there is a duplicated all caps version. If so, just delete the lower case one. If there isn't a duplicate one, then just change it to upper case.

Where to check -- the can be in both the file system or in something.TXT files

LMRKLIST.TXT

PICTLIST.TXT

LMKFILES

MAPFILES

Landmark with the name "a"

If you are tiling, which creates a default named landmark "a", and the process dies before it gets renamed, the landmark will get stuck. All other attempts to make a landmark will fail because "a" is already taken.

To fix this, remove "a" from LMRKLIST.TXT and delete it from LMKFILES. It is unlikely to be in MAPFILES, but you could check there too.

LITHOSP stuck

If SPC is running (high CPU load), but not making progress, then it is possible that an "FLOCK" is blocking processes from running.

Look at TESTFILES directory. If there is a file that is over a minute old, that might be the issue. Delete it and continue on.

Typical files that get stuck

LMRKLISTX.TXT

SHAPE.TXT

Any SUMFILE or landmark