are all menu titles kept, even if you blank out a VTS? i noticed when i blanked out a VTS, i checked the menu and it was still listed as "keep".
Yes. You're actually blanking out the PGC(s) in the selected VTS. You don't want to blank out the menu cells unless you know what it is, like warnings and logos, which can be present in the VIDEO_TS.VOB.
are menu titles ever listed in the "titleset" box?
??? Don't understand.
i heard vobblanker does not support multi angles and "ILVU titles". what are "ILVU titles"?
True, VB does not support export of multi-angle and ILVU Titles, but it will de-interleave the ILVU cells into normal cells. So you want to make sure that "Fix always VOB SYNCI/SRI pointers in Titles" is checked in the Settings. On a side note, DvdReMake supports ILVU multi-angle/story Titles.
ILVU (InterLeaved Vob Unit) cells are either used in multi-angle or multi-story (multi-PGC) Title. With multi-angle, you can switch angle during playback to view an alternate scene, such as language title or credits. An example is Howl's Moving Castle. A camera angle will display on dvd player when it reaches these cells. With multi-story, you cannot switch angle during playback because it resides in separate PGCs. Such example is the Wedding Crashers Uncorked version.