PROBLEM:

The field values are invisibile when you update field's Meta Data through Front Page RPC calls.

Use pair of DataType and Access Level (for e.g., SW) from any of the following characters while you update meta data. Any other character may cause problem in displaying the data.

RESOLUTION: 

Use pair of DataType and Access Level (for e.g., SW) from any of the following characters while you update meta data. Any other character may cause problem in displaying the data.

DataType:

B - Boolean, has a value of "true" or "false". Note that "1" can be used as a substitute for "true".
F - File system time.
I - Integer, signed integer.
S - String.
T - Time.
V - String vector.

Access Level:

R - FrontPage user can see this key in the user interface (UI), but cannot change it.
X - FrontPage user cannot see this key in the UI.
W - FrontPage client can see and change this key via the UI