Submitted by Kumpa, also found by cccz, cryptphi, hansfriese, jah, kenzo, kirk-baird, Metatron, pashov, and poirots
Normally the amount of fees after calculateFee should be added into fees[u] so that the admin could withdraw it through withdrawFee. However, illuminate ledning does not track fees[u]. Therefore, the only way to get fees back is through withdraw which admin needs to wait at least 3 days before receiving the fees.
Add the amount of fee after each transaction into fees[u] like other lending method.
for example: fees[u] += calculateFee(a);
sourabhmarathe (Illuminate) confirmed
