I think the current mind set in philosophy is that there is no progress. That for every one problem possible solved, two new problems emerge. One example is the Gettier Problem. (Here is a link to the original paper: http://philosophyfaculty.ucsd.edu/faculty/rarneson/Courses/gettierphilreading.pdf) For example, Linda Zagzebski argued that the problem is insoluble. (1) I do not know if she still holds that the Gettier Problem is insoluble. But I do believe there is a general feeling that this may be the case. Even if that is wrong, it is certain many epistemologists still wrestle with solving Gettier Problems.
I have taken quite the opposite view from the majority here. I not only believe the Gettier problem is soluble, but that it has at least two solutions. It is possible there are more, but I think there are only two strong contenders once simplicity is taken into consideration. One solution is older than the popularized version of the problem — the infamous Russellian Solution. And the other is a rather new solution; Earnest Sosa’s virtue epistemology. One is an internalist solution and the other is primarily externalist. Interestingly both give primacy to the rational features of the human mind. I believe this shows, contra Plantinga, that the Gettier problem shows the necessity of internalism.
(1) Zagzebski, Linda. “The Inescapability of Gettier Problems.” The Philosophical Quarterly (1950-) 44.174 (1994): 65-73. JSTOR. Web. 23 Feb. 2017.