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Sometimes the project takes several minutes, or even hours, to update.
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The new version gets uploaded immediately. What probably is happening is that the project gets cached by the Java Virtual Machine. One way of deleting the file from the cache is to open the Java Control Panel (right click on the Java system tray icon in Windows), go to Temporary Internet Files > Settings > Delete Files.
Maybe in some browsers clicking the refresh button while pressing the Shift key would also refresh the Java cache.
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