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The graph is not drawn or redrawn with the new data I just added or deleted

Your browser may be caching older image: clear cache. You can also set browser to check site for new image on each visit instead of using its cache.

I logged in and can't find my graph

Graphs are created per user and named "username""graph#"_calgraph.png (like admin1_calgraph.png). You can't view other users graphs from CALgraph page. You can though publish other users graphs if you know username and graph# - "Add Image" in Editor and "Browse Server" for file.

The data appears as a list below but no graph

Check /wp-content/uploads/ exists and is writeable by webserver (permissions of 755 sufficient if owned by webserver user). You can verify this is likely the problem by opening /wp-content/plugins/calgraph/calgraph.php and commenting out line:19

Change

error_reporting(1);

to

//error_reporting(1);

Retry Update/Display Graph and if you see warning similar to: Warning: imagepng() [function.imagepng]: Unable to open '../wp-content/uploads/admin1_calgraph.png' for writing: Permission denied in /usr/share/php/Image/Canvas/GD/PNG.php on line 119

Make sure uploads directory exists and has sufficient write permissions. When graph appears ok change line:19 back to what it was.