Ernst - Hi... I know we have shared a few emails too (to say the least
) but this will be a good follow up thread if there is a bug related to this issue at all.
A few comments / questions...
1. Does it save if you choose 'Basic Textbox'? Sometimes the Rich Text Editor doesn't save if AJAX is enabled but it always should if you choose Rich Text Box
2. Yes - It does appear that the settings for these templates are using the module settings tables. I agree that this is limiting if your template if larger then 2000 characters. I don't think that this has come up before because the page is split into many templates (such as header, footer, etc...) so 2000 characters has been ok in the past I believe. I think in time though this is limiting and we will want to have our own tables for these templates.
Thanks,
Chad