"problems in understanding" is a correct and usable phrase in written English.
You can use it to refer to difficulty in comprehending something. For example: "I am having some problems in understanding the new software instructions."
Problems in understanding the process of reimbursement lead to strained relations: "They do not understand the modality of reimbursement, so when we ask them to pay for medication we have to negotiate with them".
Computer modeling has yet to resolve some major problems in understanding the nature of intelligence, however.
These letters illustrate one of the central problems in understanding the Pahlavi finances -- determining the dividing line between the Pahlavi private fortune and the government's funds.
There are two big problems in understanding whether an intervention works, whether it's a medical treatment or social intervention such as changing methods for teaching reading or testing approaches to crime and punishment.
The retailer has had problems in understanding discerning Chinese consumers as their buying decisions aren't always price driven.
One of the main problems in understanding the high latitude magnetosphere and substorm dynamics is the high-level turbulence that is constantly observed within the plasma sheet.
Part of the problem in understanding how to prevent dementia is the lack of quality evidence.
Dr. Holden said one problem in understanding spanking's effects was that researchers were only beginning to study the practice in any depth.
Prediction of bed load flux remains a significant problem in understanding braided river morphodynamics for geomorphic and engineering applications.
The degree of cooperation and redundancy between different chaperones is an important problem in understanding how proteins fold in the cell.
The question is: why? "A major problem in understanding what happened when modern humans appeared in Europe has concerned the dates for our arrival," said Professor Chris Stringer, of the Natural History Museum, London.
