Hi,
Big thanks for all your feedback. Well, as mentioned by my colleague Carlos: "... the main problem is that system toolbars are not documented in the SDK ..." and because of troubles in the latest versions of the 3ds max, we decided to add the following flag in the configuration to disable the creation of toolbars at startup:
HKEY_CURRENT_USER\Software\Itoo Software\DisableToolbars = 1 (DWORD value)
On configurations with this kind of troubles, we suggest to disable these toolbars with the mentioned systém registry fix and create your own user toolbar.
Best regards,