Attribute Extraction Problem

I have a BIG problem. I am trying to extract attributes from a drawing,
which contains all sorts of blocks (normal blocks, blocks in blocks and
blocks in xrefs). For this I use ATTEXT in my LISP programm. (command
"_.ATTEXT" "C" "rms-filt.txt" "rmsused.txt")
After this I read the TXT-file and get the x, y, and z-values and the
blockname.
Now the problem. When I run my LISP the first time, all values are OK. But
when I run it a second time, ATTEXT produces some strange values, like a
block at point (100,100,25) is extracted at point 100,
2253536466646...54554555454,25. (meaning the y-value is a very large number.
My filterfile is set to N255005, else I get overflow errors.
Also I wonder why this routine works in 2000, but not in 2004. Has the
command ATTEXT changed?