The only place you can effectively change the standard Module Title is in the Page_Init event.
This has a lot to do with Timing of where things happen inside the DNN system.
The value that is displayed in the Module Title is actually read by the generic Title Skin Control during its Page_Load event.
Which means you need to set ModuleConfiguration.ModuleTitle - BEFORE - the Title Skin Control title reads the value.
The only time you can possibly do this is during your modules Page_Init event pass - if the built in DNN Title Skin Control is used.
>>>>
The alternative is to create your own TITLE Skin Control - and move the reading if the ModuleConfiguration.ModuleTitle -
I had the same issue some time back
- but did not have the info that was needed to change the TITLE correctly at the Page_Init event
- so I moved the code in the TITLE SKIN CONTROL from the PAGE_LOAD to the PAGE_PRERENDER.
With a bit of fiddling around - I can not change ModuleConfiguration.ModuleTitle in my module Page_Loads and have it reflected in the module title.
Cheers
Westa