One problem related to side/rear glass has been reported for the 1999 BMW 740. The most recently reported issues are listed below.
The double glazing glass on my 1999 BMW 740il started delaminating and has steadily gotten worse, I know of many BMW owners who complain of this defect and Bmwna is acting like there is not any problem. I went into my local BMW dealer and they say every car that they see with double glazing is delaminating! I think this is a serious defect that can impair a drivers view while driving as well.