Skadar is since 1912 in Albania,and Serbian and Montenegrinian population is on way of dissapearance. As an example,I know from my father,that the Belgrade telephone exchange was disassembled and mounted in Tirana. In spite of this,border incidents were almost regular. The third component was economical and political - Albania for years was the front runner of hard line communism in Europe,people had a very hard life and many were fleeing because for them no regular ways of getting abroad existed. The difference with the preceeding historical period was that all these events were mostly political.
Blame is on both sides.
The authorities followed the ill defined line of reasoning to keep Kosovo and Metohija in a quasi stationary state,with unevenly distributed moves aiming at improving the general state of the province. Advances are most visible on the industrial side,and somewhat less on the cultural. The Albanians followed the ill defined idea of profiting in various ways from Serbia and Yugoslavia,but contributing to them as little as possible. The authorities were letting this go,precisely in order not to create any kind of a tense situation. In such a complicated system, the future can not be predicted with any certainty.