If you feel you're waiting for TradeStation data to load and you're seeing the yellow PD in the upper left of the chart with nothing loading, you may have accidentally set TradeStation to wait on data downloads.
When TradeStation first launches and tries to load a large amount of data, a "Download Scheduler" dialog appears that asks if you want to load your data immediately or wait until "after hours." If you choose to wait, and the "don't ask again" box is checked, then TradeStation will wait until after hours to load data and won't ask again. And you'll be waiting and waiting for charts to load, as well as indicators to update, as nothing appears to be happening until after hours.
To fix this issue, you must set TradeStation to download data immediately rather than after market hours. This option is buried and tricky to find, but here's how to find it in TradeStation 10.
In TradeStation 10, click on Settings, as shown in the following image, and then Preferences.
Then in the Preferences dialog box, choose the Data tab / section. At the bottom of the list of options, check the box that says Show Download Scheduled Request dialog when Chart Analysis needs to schedule historical data for download, as shown in the image below. Close the dialog box.
Now, open a chart, and set the Timeframe so that data must be loaded. For example, if your chart normally has three days of data, load ten days. This forces the chart to request data from TradeStation's data servers. At that point, since you checked that box above, TradeStation will bring up the Download Scheduler Request dialog, and you'll have another chance to state that you need the data now. Make sure that you specify to download the data immediately and have it remember that setting. Close the dialog, and confirm that your chart data is now being downloaded immediately.
In Tradestation 9.5, first select a chart, then click on View / Chart Analysis Preferences, as shown in the following image:
In the Data tab, check the box in front of the text that starts with Show Download Scheduler Request dialog..., so the next time a chart requests data, it will bring up the following request dialog. In the Download Scheduler Request dialog, under the option, "When would you like the data to be " and choose immediately. Check the Remember this setting... box to avoid having to revisit this box again, and the next time the chart requests data, it will be obtained immediately.