There are problems with most theories and the expanding Earth theory is no exception. Most of the problems are explained in this article
[link to www.scientificexploration.org]
from the Journal of Scientific Exploration.

In a nutshell, from the above article

"In order for expansion to occur, the moment of inertia constraints must be overcome. An expanding Earth would necessarily rotate more slowly than a smaller diameter planet so that angular momentum would be conserved. In order for this to happen, the lunar tides would have to slow down, which would effect the length of the lunar month. Pannella (1972) studied the growth patterns of mollusc shells since the Ordovician. He derived an Earth year of 447 days at 1.9 Ga decreasing to an Earth year of 383 days at 290 Ma to 365 days at this time. However, the Devonian coral rings show that the day is increasing by 24 seconds every million years, which would allow for an expansion rate of about 0.5% for the past 4.5 Ga, all other factors being equal. According to the coral growth patterns then, 0.5% expansion of the planet is not enough to warrant a discussion, especially in terms of ocean basin opening, moving continents around, or the dispersal of Pangaea. All of these require Earth to have expanded by about 50%, or two orders of magnitude higher than the actual data show."

There are other problems as well, explained in the article.

In fact the only theory that explains everything with the least problems is that of True Polar Wander, AKA Pole shifts.
If this thread is going to continue I will post more details about this theory.