Signed, Unsigned syntax issues. Please help, I'm stumped

I'm still a little new to Xilinx so I'm working through some syntax
issues.  I'm working with ISE 10.1



After running "check syntax", I get the following errors.



ERROR:HDLParsers:3292 - "D:/PFiles/SS08/SS08.vhd" Line 92. = has two
or more possible definitions in this scope.  For example, parameter 2
(string value) can be: SIGNED or UNSIGNED
ERROR:HDLParsers:3292 - "D:/PFiles/SS08/SS08.vhd" Line 114. = has two
or more possible definitions in this scope.  For example, parameter 2
(string value) can be: SIGNED or UNSIGNED
ERROR:HDLParsers:3292 - "D:/PFiles/SS08/SS08.vhd" Line 145. = has two
or more possible definitions in this scope.  For example, parameter 2
(string value) can be: SIGNED or UNSIGNED



here are the lines being referred to:



Line 92:    if setup_sample = "1111111" then

Line 114:  curval <= countupstuff when setup_sample = "1111110";

Line 145:  elsif apnea_count = "1101001101010101100100000" then



The errors seem to be implying that I haven't specified these signals
as either signed or unsigned.  But the following part of my code does
specify all these signals as unsigned



(these are lines 39 through 47)


architecture Behavioral of SS08 is

signal countupstuff, curval, sample, count_1khz : unsigned (15 downto
0);
signal apnea_reset, alarm_out, clock1k, clock1k_int,  inc_apnea_count,
inc_not_apnea, clock32x, clock32x_int, settozero : std_logic;
signal apnea_count, not_apnea : unsigned (24 downto 0);
signal count_1Mhz : unsigned (4 downto 0);
signal setup_sample : unsigned (6 downto 0);

begin


Interesting note, I was previously running this code on ISE 9.1 and it
didn't have a problem with it.


Can any one shed some light on why I'm getting these errors?  It would
be very much appreciated.  Let me know if you need any more
information.



Thanks,



Jeff