Altimeter setting

Good afternoon,Searched to see if this problem occurs with others, but did not find any posts. When flying on VATSIM, the altimeter setting in the Kollsman window remains at 29.91 and if manually set to correct altimeter setting it now indicates incorrect altimeter setting. For example; current METAR calls for 30.05 for an altimeter setting (840MSL field elevation); if I manually set 30.05, an incorrect altimeter setting is reflected on the altimeter. However, if I use "B" and let FSX adjust, the altimeter needles move to the correct airport elevation but 29.91 remains constant in the Kollsman window (30.05 will not be displayed).Any ideasThanks.Gmac