PSA: Due to the scope and depth of the changes made during on this version, do not expect the game to be stable until the end of the week, it might, but it is still most likely the majority of the bug won't get caught and fixed until at least Wednesday.
This bug is really a combination of 2 less annoying ones. The first being that Frankie's training income never reset and the second that buying something that will not use teaching income will cause the bug.
Since most things only use one unit of income and Frankie's training give one income, it kinda softlocks the game from buying.