I've been working with this app today with no issue. While working on the OnStart Function, I closed and reopened the app to test the new function. Upon opening, my Form is not rendering correctly. Also some of the Controls in my app are black.
Example: 
Session ID: d7999764-c67f-4c3f-9956-9262fec39dfc
PowerApps Version: 3.18112.22
App ID: 18ea6777-ab27-4454-92c0-f097f4721024
Settings:
- All Preview Settings ON
- All Experimental Settings OFF except "Use Column Display Names"
OnStart Function: The issue happened when I added the "id" column to colVehicles. There are NO errors showing anywhere.
Set(
varSwatchTest,
Table(
{header: "Primary"},
{color: "primary_fill", colorValue: "#008291"},
{color: "primary2_fill", colorValue: "#4FA3AE"},
{color: "primary3_fill", colorValue: "#2D8A97"},
{color: "primary4_fill", colorValue: "#076572"},
{color: "primary5_fill", colorValue: "#014F5A"},
{header: "Secondary"},
{color: "secondary_fill", colorValue: "#3C4D5D"},
{color: "secondary2_fill", colorValue: "#74828F"},
{color: "secondary3_fill", colorValue: "#536474"},
{color: "secondary4_fill", colorValue: "#2E3032"},
{color: "secondary5_fill", colorValue: "#03101B"},
{header: "Accent"},
{color: "accent_fill", colorValue: "#F85D13"},
{color: "accent2_fFill", colorValue: "#FF9C6D"},
{color: "accent3_fill", colorValue: "#FF8144"},
{color: "accent4_fill", colorValue: "#C64202"},
{color: "accent5_fill", colorValue: "#9D3300"},
{header: "Grayscale"},
{color: "grayscale_fill", colorValue: "#000000"},
{color: "grayscale2_fill", colorValue: "#F5F5F5"},
{color: "grayscale3_fill", colorValue: "#C8C8C8"},
{color: "grayscale4_fill", colorValue: "#787878"},
{color: "grayscale5_fill", colorValue: "#282828"},
{header: "Additional"},
{color: "overlay_fill", colorValue: "#a9a9a9"},
{color: "info_fill", colorValue: "#007DC6"},
{color: "success_fill", colorValue: "#0EA80E"},
{color: "warning_fill", colorValue: "#F7B512"},
{color: "danger_fill", colorValue: "#C40000"}
)
);
ClearCollect(
colVehicles,
Table(
{id: 0, vehicle: " ", test: " "},
{id: 1, vehicle: "0", test: "UMT1"},
{id: 1, vehicle: "0", test: "UMT2"},
{id: 2, vehicle: "1", test: "UMT3"},
{id: 2, vehicle: "1", test: "UMT4"},
{id: 3, vehicle: "2", test: " "},
{id: 4, vehicle: "3", test: " "},
{id: 5, vehicle: "4", test: " "},
{id: 6, vehicle: "5", test: " "},
{id: 7, vehicle: "6", test: " "},
{id: 8, vehicle: "7", test: " "}
)
);
Set(varTime, TimeValue(Text(DateAdd( Now(), TimeZoneOffset(), Minutes )),"en"))Fill Property of black object: ColorValue("#4fa3ae")
Any ideas why I'm seeing this error or how to troubleshoot/debug?
Thank you