"no problem understanding" is grammatically correct and can be used in written English.
You can use it when you want to emphasize that you had no difficulty understanding something. For example, "The math problem was complicated, but I had no problem understanding it."
"We have no problem understanding conceptual visual art," he added.
First, kids are incredibly adaptable and seem to have no problem understanding that different things happen in different houses (especially if that's all they have ever known).
And I was thrilled to see that all these "young people," my students, seemed to have no problem understanding these extremely unusual voices.
As for teleology, Sober has no problem understanding certain phenomena this way, as long as there are "causal underpinnings" for a given teleological statement.
For example, sighted people would have no problem understanding that the script at the bottom of the page, detached from the main text, is a footnote.
But anyone who reads that first volume of "À la Recherche du Temps Perdu" (translated into English as "Remembrance of Things Past") has no problem understanding how 30 pages might be required to capture the turnings of self-consciousness and their cascades of recollection.
After an hour or so of scrolling through thumbnail images of enticingly beribboned baskets, I had no problems understanding why a child would want to receive one in the mail.
Most people have no problems understanding why, when the Moon is directly over head there are high tides - but then they ask why there are two tides a day!
Still, I watched the film with someone who had not seen the first movie, and had no idea which Spandex-clad titans were next on the Marvel slate, yet had no problems understanding the flow of narrative, nor complaints regarding the number of on-screen protagonists.
But the GMC panel heard evidence that Dr Ubani was competent in spoken English and his employers had no problems understanding him.
Proximate causes in biology are often observable, so students will have no problems understanding that hypotheses about proximate causes are testable.
