A customer was not able to access the online help for Sametime Meeting within the Notes embedded Sametime client. Neither the "Help Topics" link in the Meeting sideshelf nor the question mark button within a Meeting room did work. The help window appeared but it was empty.
The problem was because the customer had defined a proxy server within the Notes location document but did not exclude "localhost". The help system tries to contact "http://localhost/..." which is not accessable via the proxy server. After I added "localhost" to the exclusion list, the help pages appeared again as expected.