What do you mean, nothing happens?
Does the example code provided to you say that the suer is or is not a member of the group BETH&LES? If you try the same code for a group that dows not contain any special characters like '&' do you still have problems.

Create a user with membership in the following two groups: TESTGROUP, TEST&GROUP, the run this little piece of code:
code:
if ingroup('TESTGROUP')
? 'user '+@USERID'+'is a member of group TESTGROUP'
else
? 'user '+@USERID'+'is NOT a member of group TESTGROUP'
endif
if ingroup('TEST&GROUP')
? 'user '+@USERID'+'is a member of group TEST&GROUP'
else
? 'user '+@USERID'+'is NOT a member of group TEST&GROUP'
endif

Please report back after running this with all error messages that might ahve been created and the results for both IF-ENFIF evaluations.
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