[Typo3] Strange behavior

[M Kelders]

Hi,

Something went wrong but where is not clear... my computer was hanging so i 
needed to reboot. (winxp). Before that I had T3 installed with SQL and 
Quickstart tutorial. Doing all the exercises. When changing some TS code I 
will now get debug errors from the SQL DB. I checked the log of sql which 
says:

050813 10:37:12 InnoDB: Database was not shut down normally.
InnoDB: Starting recovery from log files...
InnoDB: Starting log scan based on checkpoint at
InnoDB: log sequence number 0 43892
InnoDB: Doing recovery: scanned up to log sequence number 0 43892
050813 10:37:12 InnoDB: Flushing modified pages from the buffer pool...
050813 10:37:12 InnoDB: Started
mysql\bin\mysqld: ready for connections.
Version: '4.0.15-max-debug' socket: '' port: 3306
Assertion failed: pos != (~(my_off_t) 0), file C:\build\mysql-
4.0.15-win-src\mysql-4.0.15\mysys\my_seek.c, line 31

The behavior is :
Update a script is oke
Seeing a front end page = oke
I go back to T3 = oke
update a script in t3 = error ... get a abort /retry/ignore 
*Warning*: mysql_fetch_assoc(): supplied argument is not a valid MySQL 
result resource in
*D:\apache\htdocs\quickstart\typo3\t3lib\class.t3lib_befunc.php
* on line *208*
or
seeing a front end page again (after first vieuw also gives a error)

*Warning*: mysql_fetch_assoc(): supplied argument is not a valid MySQL 
result resource in
*D:\apache\htdocs\quickstart\t3lib\class.t3lib_page.php*on line
*574

*If I update several times from T3 it is oke.
After normal shutdown and startup of sql it is coming again:

050813 11:01:59 InnoDB: Started
mysql\bin\mysqld: ready for connections.
Version: '4.0.15-max-debug' socket: '' port: 3306
Assertion failed: pos != (~(my_off_t) 0), file C:\build\mysql-
4.0.15-win-src\mysql-4.0.15\mysys\my_seek.c, line 31

Some suggestions what to do?

Gr,
Marcel