We have added graphics customization options, which may help with those issues. You can change the settings by clicking on the gear icon shown below:
The maximum bet limit for a round of Crash is set at 300.000 BUX right now and is subject to change in the near future.
The maximum profit limit (or bankroll) is the maximum amount someone can win in a round of Crash. It increases over time as players lose and decreases as players win. If the max profit amount is reached during a round, all players are automatically cashed out.