Linux: ./wuala doesn't work

I installed wuala on Ubuntu 7.4 2.6.20-16-generic with sun-java6.
When I use the provided shell script to start, I get the following error message:
$./wuala
Using config file /home/thomaska/.config/wualarc
Unable to access jarfile ./loader.jar

running wuala through java -jar ./loader.jar works fine though ...
What might be the problem? The $JAVA variable is set right, when I echo the start command, I get
/usr/bin/java -jar ./loader.jar
which works fine when copy-pasting it to the command line.
Inappropriate?
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