That may be the case, but the output display is matching your TFT, which is higher. Its just above the CRT, so naturally the CRT will develop refresh rate issues.
You should give that CRT monitor a good pat on the back, for lasting 2 years.
Tft screen is a flat panel display, are using both the displays at the same time, and the crt is is a cathode display, thus the incopatabilities in output.
That may be the case, but the output display is matching your TFT, which is higher. Its just above the CRT, so naturally the CRT will develop refresh rate issues.
You should give that CRT monitor a good pat on the back, for lasting 2 years.