Form submit for line add "cash sale"

Awesome project!
Thank you for all your hard work. I have a problem which I think might be a bug. I am not super familiar with bug submission so I will submit this and then go learn how to do it right... Thanks again.
Issue
When I click "add line" submit form button under erp_cash_sale (same problem on other pages that have a line add form). I get the message across the top telling me to add at least one line before submitting form (which what I am trying to do). It is almost like it is trying to submit the wrong form? It is probably something simple but I don't know how to diagnose this problem. I have tried both firefox2 and IE7. I have tried disabling jstools and devel.
Also on left of page you can see multiple menu items to same destination. I.e. cash sale and erp cash sale a few lines below. I don't know if that is by design but I would like to only have one link per function under "create content" not doubled with erp in front... See attached screenshot

Modules (downloaded today 10/13/07)
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Platform
ANhosting
Drupal 5.2
MySQL 5.0.27-standard
PHP 5.2.4
Apache/1.3.39 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2635.SR1.2 mod_ssl/2.8.30 OpenSSL/0.9.7a PHP-CGI/0.1b
No PHP mbstring installed Could this matter?