Internal Server error 500 on edit, add or copy function

Hello,

I'm not sure where to start investigating this issue so I hope you can tell me. I'm not sure if it's a data issue or some configuration issue. (I've just upgraded to the newest ASP4.1 version. )

I have two problems.
I've created a new site that uses 1 table. It tracks internal tickets for my company and consists of about 17 columns. There are approx 4300 records and I use a SQL db with IE 6
-----------------------------------------------------------

Issue #1): The first 12 records I can edit fine, but once I get to record 13 and click "Edit", I get:
Ticket#: 84024 <--- this is ok <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=3984&image=1&table=forumtopics' class='bbc_emoticon' alt=':)' />

Problem Details: Microsoft VBScript runtime error '800a0005'

Invalid procedure call or argument: 'Left'

/rcdb/libs/smarty.asp, line 192

No other fields display....
Record 14, 15 and 16 are the same but once I get to record 17 and on, and I click "Edit", I get:

The page cannot be displayed

There is a problem with the page you are trying to reach and it cannot be displayed.
HTTP 500 - Internal server error

Internet Explorer

-----------------------------------------------------------

Issue #2): If I click "Add New" (from any page) or "Copy" (from any record) I get:

The page cannot be displayed

There is a problem with the page you are trying to reach and it cannot be displayed.

HTTP 500 - Internal server error

Internet Explorer
I first thought this was a permissions issue, but then realized that I can successfuly edit the first 12 records with no problem so that theory was blown.
Your guidance is very appricated.