Four problems related to side/rear glass have been reported for the 1998 BMW 750. The most recently reported issues are listed below.
The driver and passenger windows, front and rear, are defective. The double panes separate, causing a white film to gradually appear and eventually take over the whole window, obstructing view. Attempts to resolve directly with BMW were futile due to "warranty expiration". However, a new window was installed due to breakage during the last winter storm, and already it is showing signs of the same problem. The "incident date" here refers only to the newest window which was just installed. It is not certain when the other windows began evidencing the same problem but it is obvious that the problem just gets worse over time. At the time of this writing I do not know the manufacturer of the glass but I am working on finding out so I have just picked a random name so that I can submit the complaint.
My 1998 BMW 750ial side windows (all four) are developing cloudiness where they are delaminating. Portions make visibility extremely impaired.
The safety glass on the side windows were delaminated making it hard to see out. BMW won't replace, but recognized it as a defect.
The "security" windows have started to delaminate and have cracked the drivers window. All four door windows have this problem. It looks like a bad tint job. Vision is compromised to a certain extent.