Can not update some global settings

Some of the global settings can not be updated.

paramDefaultPassword
currency
currencyPosition

Here is what I do:
1. I update the settings in the "Global settings" and click on the save icon. Message "parameters saved" shows.
2. I click on any other area in Projeqtor and then return to the Global settings, it shows the old settings.
3. I verify that the old settings indeed are in effect.
4. I browse my database with phpMyAdmin and the fields show new values.
5. parameter.php file has old values

I apretiate any suggestions. Thank you.