Attempts to measure the cross section for resonant charge transfer between hydrogen atoms and protons in the .1 eV to TOO eV energy range by the merged beams technique have been hampered by experimental problems. In particular, measured cross sections have been smaller than would be expected from theoretical treatments and other experiments. In addition, measurements at individual collision energies have not been reproducible. An investigation has revealed that these problems are caused by previously undiscovered physical effects. Correction of these difficulties has apparently paved the way for successful measurements of the charge transfer cross sections.