It appears that there have been a number of recent reports of glider's having liver cancer or other liver failures.
This has been a common report in gliders over the years with various diets being blamed - but never proven to be contributing factors.
In the past, the iron content of BML was thought to be a contributing factor - but nothing has ever been proven to link any particular diet.
Others have named diets that are too high in protein as the issue.
Truth is, we just do not know much except that gliders are prone to have liver problems.
Discussions about liver disease have been had in the past - you might do a search on Glider Central to review the past discussions if they are still available in their archives.
You might find some helpful information on the SweetSpot Forum. They deal with a number of health and medical issues.
http://thesweetspot.forumotion.net/
Another concern has been raised in the past about the use of the synthetic Vitamin K supplement Menadione. This product has been banned for human consumption for many years but unfortunately it is the ONLY APPROVED vitamin K supplement for pet foods made in the United States. It is also found in most pet vitamin supplements like RepCal Herpivite (used in BML) and in Vionate (another common pet vitamin supplement)
Because the new CritterLove products are made in the USA - these also contain Menadione as the Vitamin K supplement.
Wombaroo High Protein Supplement does NOT contain Menadione because it is made in Australia and this supplement is banned there for both human and pet foods. It contains a human grade vitamin K supplement instead.
prdycool - What is your glider's diet history? - Past diets for how long and current diet? The discussion needs to be opened to see if there is a pattern that does relate to diets, although your glider's age may also have a lot to do with his illness.