mysql claims table does not exist. but it does

Hi there,
I have a strange problem.

I am using Server version: 5.0.45 SUSE MySQL RPM

I made a backup of a database by copying its directory like so: mv urulu urulu_X
then I recreateded the database, played a little with it and then dropped it again.
the I moved the old database in place again. now when I want to access the tables of the database I get an error that the tables do not exist, alltough the showtables lists them correctly.

what can I do to fix that?
to explayin thin a bit better, here a dump of an mysql dialog

mysql> use urulu
Database changed
mysql> show tables;

+------------------+

+------------------+

| dataccess        |
| datancestors     |
| datchildren      |
| datserialisation |
| datstat          |
| datvariables     |
| datwidgets       |
| defchildren      |
| defdependencies  |
| defgeneral       |
| defhandler       |
| defvariables     |
| lang             |
| session          |
| synaccess        |
| synconnect       |
| syncreate        |
| syndata          |
| synproperties    |
| syntoc           |
| xslcache         |

+------------------+

mysql> select * from lang;
ERROR 1146 (42S02): Table 'urulu.lang' doesn't exist mysql>

thanks
robert

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