Hello Daniel,
I cannot provide a definitive answer without knowing the exact problem. From my experience this can have several seemingly unrelated causes:
1) There are several charts of the same market available and you happen to look at one with fewer data. This can happen with the Dax-Mini and the Normal-Dax for example.
2) Sometimes the exact same instrument is available twice. You can find out by using the keyword search and checking the list of all matching markets.
3) Some markets have only a few bars of data, like the VIX for example.
4) And sometimes data just disappears for some time before reappearing just as unexpected. My Dax data reaches only back 4 years every second time I look instead of all the way to ’89. In this case I suggest you contact PRT and your broker via a support ticket.
Hope this helps.
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