A number of graphics options persist from session to session, which started maybe in SAS version 9(?) where prior they didn't.
One statement you will want to learn if you continue to use the device based graphics procedures (gplot, gchart, gmap) is:
goptions reset=all;
Which will reset all the options to the installed defaults.
Note the reset will also take some arguements to affect just a subset of options, read the documentation, but when things start going very badly then reset everything.
If you were not making Axis statements I suspect that you may have been running a data step that was duplicating data when you only really needed ot work with the GPLOT code. One place to look at datasteps very carefully is using the structure:
Data SomeDataset;
Set SomeDataset;
<code>;
run;
Depending on what is actually in that <code> section rerunning the data step multiple times can yield very bad data.
Here's an exampe;
Data example;
set example;
if 1< age <14 then age=age-1;
run;
If you actually have an age variable with values that start under 14 then rerunning that datastep multiple times will end up with a bunch of age vales of 1.
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